ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY
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The Use of Quadtree Range Domain Partitioning with Fast Double Moment Descriptors to Enhance FIC of Colored Image
Get PDFIn this paper, an enhanced fractal image compression system (FIC) is proposed; it is based on using both symmetry prediction and blocks indexing to speed up the blocks matching process. The proposed FIC uses quad tree as variable range block partitioning mechanism. two criteria’s for guiding the partitioning decision are used: The first one uses sobel-based edge magnitude, whereas the second uses the contrast of block. A new set of moment descriptors are introduced, they differ from the previously used descriptors by their ability to emphasize the weights of different parts of each block. The effectiveness of all possible combinations of double moments descriptors has been investigated. Furthermore, a fast computation mechanism is introduced to compute the moments attended to improve the overall computation cost. the results of applied tests on the system for the cases “variable and fixed range” block partitioning mechanism indicated that the variable partitioning scheme can produce better results than fixed partitioning one (that is, 4 × 4 block) in term of compression ratio, faster than and PSNR does not significantly decreased
Solidworks Simulation of Mechanical Properties of Recycled Plastics/Nanocomposite Faces Sandwich Panels
Get PDFSandwich panels are lightweight, high strength materials desired by engineers for various applications. However, many contributions cited the replacement of the metallic surfaces with reinforced polymeric composites for additional weight reduction purpose but none observed for recycled plastics. Accordingly, this work plans to investigate the mechanical behavior of sandwich panels made of recycled plastic/Nano reinforced composites under tension, compression, and bending load using Solidworks simulation. The data were obtained from previous works, and the complementary data were collected using different approaches. All models revealed that polycarbonate (PC) skin dominated over polypropylene and high-density polyethylene due to the highest modulus of elasticity. However, the results indicated that the core unless reinforced the outer skins will be separated as a result of residual strain at interfaces. Consequently, the core of PC skin sandwich panel reinforced with two thin sheets which lead to improvement in loading endurance from 500 to 1500N without exceeding the allowable limits of the materials and leading to the birth of environmentally intimated material termed green sandwich panel
Effect of Styrene Butadiene Rubber Latex on Mechanical Properties of Eco Concrete: Limestone Powder Concrete
Get PDFTo make concrete a truly green material, viable cement substitutes are available. This experimental investigation is performed to study the effect of using limestone powder (LSP) and styrene butadiene rubber (SBR) latex in the concrete mix. In this work, a concrete with 1:1.8:3 cementitious material:sand:gravel and water/cement ratio w/c of 0.5 is produced. First, LSP is used with 0, 5, 10, 15, and 20% replacements by weight of cements. The fineness of the LSP is measured using sieve No. 200 and showed about 30% pass. Second, and to improve the matrix of concrete due to the dilution effect, four ratios of SBR latex (0, 5, 10, and 15%) are added by weight of cements to the mix for each LSP ratio. Compressive strength at ages of 3, 7, 14, 28, and 90 days is tested for the concrete specimens mixed with LSP only to examine its effect on concrete strength’s development with time, whereas strengths are recorded at the age of 28 days for the other concretes. Three prisms were cast for each ratio and tested at 28 days. The results show general improvements in terms of compressive and flexural strengths
VOLUME 6, NO 2 (2018)
No full textDear readers,Aro, the Scientific Journal of Koya University, is closing its eleventh issue (Vol VI, No 2, 2018). It has been an exciting and yet dynamic season for our journal. Aro is publishing its 6th issue as an internationally listed Scientific Journal in Kurdistan Region of Iraq. Notably, Aro has been accepted for indexing in the Emerging Sources Citation Index (ESCI), a new edition of Web of Science™ as of Feb 2016. Content in this index is under consideration by Thomson Reuters to be accepted in the Science Citation Index Expanded™ (SCIE). Aro’s individual articles are currently listed by Thomson Reuters using articles unique DOI numbers which is a historical achievement for our academic community. Aro is starting its sixth-year journey in leading the quality of regional scientific publications with global impact. The editorial team have been working tirelessly to keep the novel mission and sustain Aro’s future publications with greater impacts and citations. It is exciting that Aro has been awarded to DOAJ Seal listing which is an indication of a trusted high standard open access scientific work. The upcoming new season will be an even more exciting period in Aro’s life as Thomson Reuters will examine our journal for a full permanent listing.Aro continues its mission to provide resources, support and advice for researchers in the process of publishing their scientific papers, while at the same time offering free public access to scientific research by open online access. This is a daunting task which we hope to advance in the years to come. Thus, in the sections to follow, we would like to share and elaborate on the core elements that constitute Aro. However, finding reliable and skilled reviewers remain a big challenge for us.Aro was created with a long-term vision of becoming accessible to all researchers in Kurdistan and beyond, and covering a wide range of scholarly disciplines in sciences. Aro is a peer-reviewed, open access journal that publishes original scientific research, global news, letters and commentary as well as review articles in areas of natural sciences and technology. In this issue, you will have access to original research papers in a variety of areas, such as Physics, Chemistry, Biology, Material Science, Civil Engineering, Architectural Engineering, Software Engineering, Electrical and Electronics Engineering, Petroleum Engineering and Geology.The great responses from researchers, academics and professionals in the last five years have made us create a wider Editorial Board which serves the wider submitted scientific manuscripts. However, it is clear that having a dedicated and well-organised editorial board for the journal is only one side of the coin. The other is the ability to attract submissions of quality research and scholarly work. We are thankful to all of those who put their trust in Aro and presented their original research work for publication in Vol VI, No 2 (2018) of the journal, as well as, our thanks are extended to the 20 peer-reviewers from the Universities worldwide for their efforts in reviewing and enabling this issue of Aro.Your support and feedback are invited and appreciated.Dilan M. RostamEditor-in-ChiefWali M HamadExecutive PublisherDilan M. Rostam, Salah I. Yahya, Basim M. Fadhil, Fahmi F. Muhammad, Mohammed H.S. Zangana, Jorge Correia, Fouad Muhammad and Nadhir Al-AnsariExecutive Editorial Boar
Load Balancing Evaluation Tools for a Private Cloud: A Comparative Study
Get PDFCloud computing turns out to be an emerging technology that revolutionized the world of IT infrastructure. However, since the number of users is increasing daily, the demand for cloud services is increasing too. Thus, congestion occurs on the servers that provide services in the cloud. To avoid congestion, we used load balancer tools such as HAProxy and Nginx to intercept the requests of users and distribute them evenly to the servers. Jmeter is used to measure the performance metrics of least connection algorithm in terms of CPU utilization, response time, and concurrency level. Results showed high performance of HAProxy compared to Nginx in terms of response time and treating requests. Furthermore, we examined the characteristic of availability of the load balancer through deploying redundant load balancers, and we studied the effect of the failure of the load balancer on the quality of service of the end users. Keepalived is used to ensure a smooth transition between the two load balancers. According to the concurrency level, results proved that the number of unsuccessful requests during the failure of the master load balancer is proportionally minuscule compared to the total number of requests sent in a normal situation.
Synthesis and Liquid Crystalline Studies of 2,4-bis(4'-n-nonyloxybenzoyloxy)benzylidene-4''-n-alkoxyaniline
Get PDFIn this paper, a series of new Schiff-bases: 2,4-bis(4’‑n‑nonyloxy -benzoyloxy)benzylidene-4’’-n-alkyloxyaniline (DC9An) were synthesized. The characterization of compounds was achieved through using (ultra violet, infrared, 1H-nuclear magnetic resonance) measurements. This series comprises 10 members differ by the length of n-alkoxy chain (i.e., OCnH2n+1, n=1-10). Their liquid crystalline properties were studied using differential scanning calorimetry and polarizing optical microscopy. The lower series such as n=1-3 are purely nematogenic liquid crystals, but the other means (n=4-7) have nematic and smectic phases (SmC and SmA). The higher members (n=8-10) are purely smectogenic liquid crystals
Three-dimensional Image Segmentation using Tissue-like P System
Get PDFMembrane computing (MC), which abstracts computational models from the structure and functioning of biological cells or population of cells in tissues, has served as a rich framework for handling many problems. Various types of P systems have been proposed in the literature to perform edge-based and region-based segmentation of two-dimensional digital images. However, less attention has been paid to the segmentation of three-dimensional (3D) medical images. Hence, the main contribution of this paper is to propose a tissue-like P system for segmenting 3D medical images. To the best of our knowledge, this is the first work that practically adapts MC for 3D images. Experimental results demonstrate the efficiency of the proposed approach in segmenting 3D images, and it has the potential to be used in real-worldapplications
Synthesis and Characterization of Sodium Diphenylcarbamodithioate Ligand [L] and its Cobalt, Nickel, and Copper Complexes
Get PDFA correlation of the infrared spectra of thiocarbonyl derivatives based on the literature data has been carried out. Assignments have also been made in some new systems. Sodium Diphenylcarbamodithioate ligand and its monomeric complexes were synthesized at room temperature and stirring condition. The ligand and its complexes of the general formula [M(L)2] (where M= Co+2, Ni+2 and Cu+2) were characterized by spectroscopic methods (IR and ultraviolet-visible), elemental analysis (C.H.N. and S) metal content, magnetic susceptibility measurement, and biological activity (an antibacterial activity of the complex was studied by agar disc diffusion method and minimum inhibitory concentration strain against Staphylococcus aureus and Bacillus subtilis). The complex exhibited significant activities against S. aureus and B. subtilis, thin-layer chromatography, mass spectrometry, X-ray powder diffraction, and molar conductance. Our study revealed the formation of four-coordinate square planar complexes around Coп, Niп, and Cuп metal ions
VOLUME 5, NO 2 (2017)
No full textDear readers, Aro-the Scientific Journal of Koya University is closing its ninth issue (Vol V, No 2, 2017) after an exciting yet dynamic season of valuable inputs by our research community and supportive reviewers. Aro is publishing its 4th issue as an internationally listed Scientific Journal in Kurdistan Region of Iraq. Notably, Aro has been accepted for indexing in the Emerging Sources Citation Index (ESCI), a new edition of Web of Science™ as of Feb 2016. Content in this index is under consideration by Thomson Reuters to be accepted in the Science Citation Index Expanded™ (SCIE). Aro’s individual articles are currently listed by Thomson Reuters using articles unique DOI numbers which is a historical achievement for our academic community. Aro is ending its fifth year journey in leading the quality of regional scientific publications with global impact. The editorial team has been working tirelessly to keep the novel mission and sustain Aro’s future publications with greater impacts and citations. It is exciting that Aro has been awarded to DOAJ Seal listing which is an indication of a trusted high standard open access scientific work that so far haven allocated to 88 journals worldwide only. The upcoming new season will be an even more exciting period in Aro’s life as Thomson Reuters will examine our journal for full permanent listing.Despite all ongoing regional conflicts and economic downturn which still having a great impact on scientific research activities and funding of the regional universities in general and Koya University in particular, Aro is continuing to receive great numbers of well-motivated quality papers which shows its steadily growing trust among researchers in the region, demanding the increased volume of publication. Nevertheless, Aro is finding more focus in applied sciences with research values in current regional issues having International impacts.Aro was created with long-term visions of becoming accessible to all researchers in Kurdistan and beyond, and covering a wide range of scholarly disciplines in sciences. Aro is a peer-reviewed, open access journal that publishes original scientific research, global news, letters and commentary as well as review articles in areas of natural sciences and technology. In this issue you will have access to original research papers in variety of areas, such as Physics, Biochemistry, Materials Science and Petroleum, Chemical and other fields of Engineering.The great responses from researchers, academics and professionals in the last five years have made us to create a wider Editorial Board which serves the wider submitted scientific manuscripts. However, it is clear that having a dedicated and well organised editorial board for the journal is only one side of the coin. The other is the ability to attract submissions of quality research and scholarly work. We are thankful to all of those who put their trust in Aro and presented their original research work for publication in Vol V, No 2 (2017) of the journal, as well as, our thanks are extended to the 16 peer-reviewers from the Universities worldwide for their efforts in reviewing and enabling this issue of Aro.Your support and feedback are invited and appreciated. Dilan M. RostamEditor-in-Chief Wali M HamadExecutive Publisher Dilan M. Rostam, Salah I. Yahya, Basim M. Fadhil, Fahmi F. Muhammad, Mohammed H.S. Zangana, Jorge Correia and Fouad MuhammadExecutive Editorial Boar
Kurdish Dialects and Neighbor Languages Automatic Recognition
Get PDFDialect recognition is one of the most hot topics in the speech analysis area. In this study a system for dialect and language recognition is developed using phonetic and a style based features. The study suggests a new set of feature using one-dimensional LBP feature. The results show that the proposed LBP set of feature is useful to improve dialect and language recognition accuracy. The acquired data involved in this study are three Kurdish dialects (Sorani, Badini and Hawrami) with three neighbor languages (Arabic, Persian and Turkish). The study proposed a new method to interpret the closeness of the Kurdish dialects and their neighbor languages using confusion matrix and a non-metric multi-dimensional visualization technique. The result shows that the Kurdish dialects can be clustered and linearly separated from the neighbor languages